To get your head around new code 799.82, you've got to be up on the vocab. The National Institutes of Health Consensus Development Conference defines ALTE as "an episode that is frightening to the observer and that is characterized by some combination of apnea (central or occasionally obstructive), color change (usually cyanotic or pallid but occasionally erythematous or plethoric), marked change in muscle tone (usually marked limpness), choking, or gagging. In some cases, the observer fears that the infant has died," according to the 1987 Pediatrics article "National Institutes of Health Consensus Development Conference on Infantile Apnea and Home Monitoring" (Volume 79, pages 292-299).